Spiral wheel for replacing railroad-cars tjpou the track



R. P. R. LEWIS. BAR BEPIAGER.

No/12,684. PatentedApnlO, 1855.-

- '7 V I jnmnz'or;

ToaZZ whom it m dyconcern i 1 Be it known that 1, R El l'l F. RJL WIS,

otAnnapolis, in the county of Anne Arun del, State of Maryland, have invented a new i and useful improvementfon rail trucks or carriages for preventing the same from runa, ning off o-rj beingthrown from the track while in forward motion by applying there N to} one or} more castfor wrought iron hollow 1 cylinders, threadedorlwonned flanged on its exterior surface in themanner' oj-fa plane screw in 1 place of V theordinary flange I wheel; andI doherebydeclare that the 1501- lowing is a full, clear, anjdexact description of the construction and operation 1 of the xsaine, referencebeing had to the annexed 1 drawings, makingua part offthis specification,in which-s i Figures land 2 are perpendicular,-3 and 4 front views of truck frames, wheels, rollers J &c.,and Fig. 5, is a longitudinal section of the interior view of the cylinder.

KI construct the trouser my trucks or 1 carriages in any of the common or known forms, (with the additiomof brace pieces a, a, @Fig. 1 for axle box &c., where one cylinder only is used to each truck or carriage frame) and apply thereto, one or more cylinders, thread flanged in the mannerb, Z), Z) &c.as @shown in Figs. land 2, &c, made and constructed of cast oruwrought iron and ofthe same diameter as" the ordinarye flanged wheels 6, c, Fig? 1,at those parts or sections of its circumference which will come in con tact withaeither rail, whenfproperly adjusted to the track asshown Fig. 2-. At the center i and ends, the diameters areto be gradually decreased to give a clearance in the middle,

and onboth outsides of the track, the dis Etances 10f thewo-rinedn jflanges or screw i i i i a n RFLEw s, or ANnAPdLIsMARYnANDu srrimn im ltnrtnorive nnrtnonn-onas UPONTHE TRACK.

Specijficati onlof Letters QEatent No. 12,684, dated April 10, 1855.

threads 6, 6,?) &c. around the cylinderbarrel, are to beso regulated (depending on the width of rail iron) as not to jam-the rail,

and thereby prevent a free and proper action of the sa ine, in cases of deflect-ion Fig. 4, of

wheel proper, or traveling section d, d, of cylinder barrel from the track, and in depth and thickness, to correspond with that of the ordinary wheel flange, the thickness of metal composing the cyllnder barrel, to be the same as now used in the construction of the tread of the ordinary flange wheel, and to be supported internally, by spokes or solid divisions 6 e c &c. Fig. 5, having an axle mv, extending through its entire length, and projecting at either end a, n, for placing axle box 620.

.VVhen by deflection of wheel proper, or

traveling sections of cylinder barrel, d, d, Fig. 4, from the track the wormed flanged or screw threads, b, b, &c.acts or binds against either rail, and by the instantaneous forward revolution of cylinder barrel, in motion, itis readjusted to the track.

What I claim as my invention and desire to secure by Letters Patent, is

The applicatio-n of one or more, cast or wrought lron hollow cylinders, wormed flanged or screw threaded on their exterior surfaces in the manner of a plain screw, to

rail trucks or carriages, in place of, or in combination with the common or ordinary flange wheel, as herein described, and there,

by prevent thesame from running off, or 

